docs: def is_valid_sites(self):
          """
          The sites are overdetermined
          """
          if 'site_model' in self.inputs and 'sites' in self.inputs:
              return False
          elif 'site_model' in self.inputs and self.sites:
              return False
          elif 'sites' in self.inputs and self.sites:
              return False
          elif self.sites and self.region and self.region_grid_spacing:
              return False
          else:
              return True